JP2008202071A - Method for operating blast furnace gas cleaning facility - Google Patents

Method for operating blast furnace gas cleaning facility Download PDF

Info

Publication number
JP2008202071A
JP2008202071A JP2007037255A JP2007037255A JP2008202071A JP 2008202071 A JP2008202071 A JP 2008202071A JP 2007037255 A JP2007037255 A JP 2007037255A JP 2007037255 A JP2007037255 A JP 2007037255A JP 2008202071 A JP2008202071 A JP 2008202071A
Authority
JP
Japan
Prior art keywords
blast furnace
furnace gas
dust collection
dust
electrostatic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2007037255A
Other languages
Japanese (ja)
Inventor
Katsumi Mori
克己 森
Takashi Hida
孝 肥田
Hirobumi Onoe
博文 尾上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Nippon Steel Engineering Co Ltd
Nippon Steel Plant Designing Corp
Original Assignee
Nittetsu Plant Designing Corp
Nippon Steel Corp
Nippon Steel Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nittetsu Plant Designing Corp, Nippon Steel Corp, Nippon Steel Engineering Co Ltd filed Critical Nittetsu Plant Designing Corp
Priority to JP2007037255A priority Critical patent/JP2008202071A/en
Publication of JP2008202071A publication Critical patent/JP2008202071A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Landscapes

  • Separation Of Particles Using Liquids (AREA)
  • Electrostatic Separation (AREA)
  • Blast Furnaces (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for operating a blast furnace gas cleaning facility by which the reducing of recovering energy is prevented by eliminating the stop of the operation for long time in an electrostatic dust collection part and also, the dust collective efficiency can be improved. <P>SOLUTION: In the method for operating the blast furnace gas cleaning facility, by which the blast furnace gas generated from the blast furnace having the blast furnace top pressure recovering facility, is cleaned with a wet-type dust collector having a variable throat and the electrostatic dust collector; the operational method for blast furnace gas cleaning facility is as the followings, that is, when the blast furnace gas is passed through the blast furnace top pressure recovering facility, the following process 1 and process 2, are alternately performed. The process 1; the process, in which the variable throat in the wet type dust collector is almost wholly opened and only water-spraying is performed to perform the dust collection in the blast furnace gas with the electrostatic dust collector. The process 2; the process, in which after stopping the operation of the electrostatic dust collection, the dust piled up to the electrode in this electrostatic dust collector is water-washed and also, the dust collection in the blast furnace gas is performed in the wet-type dust-collector while continuing almost the whole closing of the variable throat in the wet-type dust collector and the water-spraying in the above process. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、高炉炉頂圧力回収設備を有する高炉から発生する高炉ガスを、可変スロートを有する湿式集塵部と静電集塵部とにより清浄化する高炉ガス清浄設備の操業方法に関する。   The present invention relates to a method for operating a blast furnace gas cleaning facility that cleans blast furnace gas generated from a blast furnace having a blast furnace top pressure recovery facility by a wet dust collection unit having a variable throat and an electrostatic dust collection unit.

近年、高炉は高圧操業が採用されており、高圧の高炉ガスが有するエネルギーの有効利用を図るため、高炉ガスを清浄化して高炉の燃焼ガス等の燃料として再利用されるが、高炉炉頂圧回収設備を設け、高圧の高炉ガスからエネルギーを回収して発電が行われている。   In recent years, high-pressure operation has been adopted for blast furnaces, and in order to effectively use the energy of high-pressure blast furnace gas, blast furnace gas is cleaned and reused as fuel such as blast furnace combustion gas. A recovery facility is provided to generate power by recovering energy from high-pressure blast furnace gas.

ところで、高炉炉頂圧回収設備を設置した高圧高炉におけるガス清浄設備としては、可変スロートを有する湿式集塵部（ベンチュリースクラバー）と静電集塵部とを有する高炉ガス清浄設備が用いられている。   By the way, as a gas cleaning equipment in a high pressure blast furnace provided with a blast furnace top pressure recovery equipment, a blast furnace gas cleaning equipment having a wet dust collecting part (venturi scrubber) having a variable throat and an electrostatic dust collecting part is used. .

この高炉ガス清浄設備に関しては、従来から種々の提案がなされており、例えば、下記特許文献１には、高炉炉頂圧力回収設備を有し、可変スロートを有する湿式集塵部と静電集塵部とで構成されてなる高炉ガス清浄設備の操業方法であって、高炉ガスを前記炉頂圧力回収設備へ通ガスする期間には、主としてガスの集塵を前記静電集塵部で行って当該集塵時の圧力損失を極減させ、通ガスしない期間には、湿式集塵部にて集塵をおこない、その結果、回収エネルギーを増大させると共に所望の集塵効率を達成させることができる操業方法が開示されている。   Various proposals have been made regarding the blast furnace gas cleaning equipment. For example, Patent Document 1 listed below includes a blast furnace top pressure recovery equipment, a wet dust collection unit having a variable throat, and electrostatic dust collection. And operating the blast furnace gas cleaning equipment, wherein during the period when the blast furnace gas is passed through the furnace top pressure recovery equipment, the gas dust collection is mainly performed at the electrostatic dust collection section. The pressure loss during dust collection is extremely reduced, and during the period when gas is not passed, dust collection is performed in the wet dust collection unit. As a result, the recovery energy can be increased and the desired dust collection efficiency can be achieved. A method of operation is disclosed.

しかし、この特許文献１の高炉ガス清浄設備の操業方法では、静電集塵部においてスパーク等による異常放電が発生した場合に、高炉炉頂圧回収設備による発電を１０〜３０日間中止する必要が生じ、多大な発電量の損失が生じるという問題点があった。
特公昭５９−１０９７２号公報 However, in the operation method of the blast furnace gas cleaning facility of Patent Document 1, it is necessary to stop the power generation by the blast furnace top pressure recovery facility for 10 to 30 days when an abnormal discharge due to a spark or the like occurs in the electrostatic dust collection unit. There was a problem that a large loss of power generation occurred.
Japanese Patent Publication No.59-10972

そこで、本発明は、前述のような従来技術の問題点を解決し、静電集塵部での長期間の運転停止をなくして回収エネルギーの低下を防止すると共に、集塵効率を向上させることができる高炉ガス清浄設備の操業方法を提供することを課題とする。   Therefore, the present invention solves the problems of the prior art as described above, eliminates long-term operation stoppage in the electrostatic dust collection section, prevents a decrease in recovered energy, and improves dust collection efficiency. It is an object of the present invention to provide a method for operating a blast furnace gas cleaning facility that can be used.

本発明は、前述の課題を解決するために鋭意検討の結果、高炉ガスを前記高炉炉頂圧力回収設備へ通ガスする際に、静電集塵部による集塵と、湿式集塵部による集塵とを交互に返して実施することにより、静電集塵部での長期間の運転停止をなくして回収エネルギーの低下を防止すると共に、集塵効率を向上させることができる高炉ガス清浄設備の操業方法を提供するものであり、その要旨とするところは特許請求の範囲に記載したとおりの下記内容である。
（１）高炉炉頂圧力回収設備を有する高炉から発生する高炉ガスを、可変スロートを有する湿式集塵部と静電集塵部とにより清浄化する高炉ガス清浄設備の操業方法であって、高炉ガスを前記高炉炉頂圧力回収設備へ通ガスする際に、下記工程１と工程２とを交互に繰り返して実施することを特徴とする高炉ガス清浄設備の操業方法。 As a result of intensive investigations to solve the above-mentioned problems, the present invention is designed to collect dust by an electrostatic dust collection unit and by a wet dust collection unit when passing blast furnace gas to the blast furnace top pressure recovery facility. By implementing the dust and dust alternately, it is possible to eliminate the long-term shutdown at the electrostatic dust collection unit, prevent the recovery energy from being lowered, and improve the dust collection efficiency. The operation method is provided, and the gist thereof is the following contents as described in the claims.
(1) A method for operating a blast furnace gas cleaning facility for purifying blast furnace gas generated from a blast furnace having a blast furnace top pressure recovery facility by a wet dust collection unit having a variable throat and an electrostatic dust collection unit, A method for operating a blast furnace gas cleaning facility, wherein when the gas is passed through the blast furnace top pressure recovery facility, the following steps 1 and 2 are alternately repeated.

ここに、工程１：前記湿式集塵部の可変スロートをほぼ全開として散水のみを行い、高炉ガスの集塵を前記静電集塵部で実施する工程。   Here, step 1: a step of performing dust collection of blast furnace gas in the electrostatic dust collection unit by performing only watering with the variable throat of the wet dust collection unit being almost fully opened.

工程２：前記静電集塵部の運転を停止させた後、当該静電集塵部の電極に堆積したダストを水洗すると共に、前記前記湿式集塵部の可変スロートをほぼ全閉及び前記工程１の散水を継続して高炉ガスの集塵を前記湿式集塵部で実施する工程。   Step 2: After stopping the operation of the electrostatic precipitator, the dust accumulated on the electrode of the electrostatic precipitator is washed with water, and the variable throat of the wet precipitator is substantially fully closed and the step A step of continuing the watering of 1 and collecting the blast furnace gas in the wet dust collecting section.

（２）前記工程１から工程２への交互の繰り返し時期を前記工程１における静電集塵部の荷電電圧の低下が始まる直前時期とし、当該直前時期に１０分間〜３０分間の前記工程２を実施後、引き続き工程１を継続実施することを特徴とする（１）に記載の高炉ガス清浄設備の操業方法。
（３）前記静電集塵部の電極に堆積したダストを有効圧200KPa以上400Kpa以下の高圧水により洗浄することを特徴とする（１）または（２）に記載の高炉ガス清浄設備の操業方法。
＜作用＞
（１）の発明によれば、静電集塵部による集塵と、湿式集塵部による集塵とを交互に繰り返して実施し、静電集塵部における集塵板に堆積するダストを間歇的に水洗・除去することにより、放電線の異常放電が発生することが皆無となり静電集塵部での長期間の運転停止をなくして回収エネルギーの低下を防止すると共に、集塵効率を向上させることができる。
（２）の発明によれば、工程１から工程２への交互の繰り返し時期を工程１における静電集塵部の荷電電圧の低下が始まる直前時期とし、当該直前時期に１０分間〜３０分間の工程２を実施後、引き続き工程１を継続実施することにより、結果的に圧力損失の少ない静電集塵部による集塵時間を長くすることになり、高炉炉頂圧力回収設備による回収エネルギーを増加させることができる。
（３）の発明によれば、静電集塵部の電極に堆積したダストを有効圧200Kpa以上400Kpa以下の高圧水により洗浄して洗浄時間を短時間にすることにより、高炉炉頂圧力回収設備による回収エネルギーを増加させることができる。 (2) The alternating repetition time from the step 1 to the step 2 is set as a time immediately before the decrease in the charged voltage of the electrostatic precipitator in the step 1 starts, and the step 2 for 10 minutes to 30 minutes is set to the immediately preceding time. After the operation, the method for operating the blast furnace gas cleaning facility according to (1), wherein the step 1 is continuously performed.
(3) The method for operating a blast furnace gas cleaning facility according to (1) or (2), wherein dust accumulated on the electrode of the electrostatic dust collecting part is washed with high-pressure water having an effective pressure of 200 KPa to 400 Kpa. .
<Action>
According to the invention of (1), dust collection by the electrostatic dust collection unit and dust collection by the wet dust collection unit are alternately repeated, and dust accumulated on the dust collection plate in the electrostatic dust collection unit is intermittently collected. By removing the water and removing it completely, abnormal discharge of the discharge line will never occur, eliminating the long-term shutdown at the electrostatic precipitator, preventing the recovery energy from decreasing and improving the dust collection efficiency. Can be made.
According to the invention of (2), the alternating repetition time from step 1 to step 2 is set as the time immediately before the decrease of the charging voltage of the electrostatic dust collecting portion in step 1 starts, and the time immediately before the time is 10 minutes to 30 minutes. Continuing to implement step 1 after performing step 2 results in a longer dust collection time by the electrostatic precipitator with less pressure loss and increased recovery energy from the blast furnace top pressure recovery facility Can be made.
According to the invention of (3), the dust accumulated on the electrode of the electrostatic precipitator is washed with high-pressure water having an effective pressure of 200 Kpa or more and 400 Kpa or less to shorten the washing time, thereby providing a blast furnace top pressure recovery facility. The recovered energy can be increased.

本発明によれば、高炉ガスを前記高炉炉頂圧力回収設備へ通ガスする期間において、集塵効率が低下することなく静電集塵部における長期間の操業停止が皆無となり、これにより高炉炉頂圧力回収設備による回収エネルギーが大幅に増加させることができるなど、産業上有用な著しい効果を奏する。   According to the present invention, during the period of passing blast furnace gas to the blast furnace top pressure recovery facility, there is no long-term operation stoppage in the electrostatic dust collection section without lowering the dust collection efficiency. The energy recovered by the top pressure recovery facility can be greatly increased, and there are significant industrially useful effects.

本発明を実施するための最良の形態について図１〜図４を用いて詳細に説明する。   The best mode for carrying out the present invention will be described in detail with reference to FIGS.

図４は、本発明の操業方法を適用する高炉ガス清浄設備を例示する図である。   FIG. 4 is a diagram illustrating a blast furnace gas cleaning facility to which the operation method of the present invention is applied.

図４において、Ａ は湿式集塵部（ベンチュリースクラバー）、Ｂは静電集塵部、１は高炉、２はダストキャッチャー、３は炉頂圧力制御弁、４は炉頂圧力回収設備、５は集塵板、６は放電極、７は水位制御弁を示す。   In FIG. 4, A is a wet dust collector (Venturi scrubber), B is an electrostatic dust collector, 1 is a blast furnace, 2 is a dust catcher, 3 is a furnace top pressure control valve, 4 is a furnace top pressure recovery facility, A dust collecting plate, 6 is a discharge electrode, and 7 is a water level control valve.

図４に示すように、高炉１から排出された高炉ガスは、ダストキャッチャー２により粗大な塵が除去された後、可変スロートを有する湿式集塵部Ａ（ベンチュリースクラバー）、および、静電集塵部Ｂからなる高炉ガス清浄設備により微細な塵が除去され清浄化された後、高炉炉頂圧力回収設備４へ通ガスされて発電することによりエネルギーを回収することができる。   As shown in FIG. 4, the blast furnace gas discharged from the blast furnace 1 is subjected to removal of coarse dust by the dust catcher 2, and then a wet dust collection part A (Venturi scrubber) having a variable throat and electrostatic dust collection. After the fine dust is removed and cleaned by the blast furnace gas cleaning facility comprising the part B, the energy can be recovered by passing the gas through the blast furnace top pressure recovery facility 4 and generating electricity.

湿式集塵部Ａ（ベンチュリースクラバー）は、図示されていない可変スロートにより高炉ガスの流速を調整しつつ散水することにより圧力損失をかけて集塵を行うものであり、可変スロートをほぼ全閉にして集塵を行う場合には、約３０KPaの圧力損失が生じる。   The wet dust collector A (Venturi scrubber) collects dust by applying pressure loss by sprinkling water while adjusting the flow rate of the blast furnace gas with a variable throat (not shown). The variable throat is almost fully closed. When collecting dust, a pressure loss of about 30 KPa occurs.

一方、静電集塵部Ｂは、放電極６に通電することにより、集塵板５に塵を付着させて集塵を行うものであり、圧力損失は約５KPa程度に抑えることができる。   On the other hand, the electrostatic dust collecting part B collects dust by attaching the dust to the dust collecting plate 5 by energizing the discharge electrode 6, and the pressure loss can be suppressed to about 5 KPa.

なお、図４は、湿式集塵部Ａ（ベンチュリースクラバー）と静電集塵部Ｂとが一体に構成されているが、これらを分離させてもよい。   In FIG. 4, the wet dust collector A (Venturi scrubber) and the electrostatic dust collector B are integrally configured, but they may be separated.

図１は、高炉ガス清浄設備における従来の操業方法を例示する図であり、図１（a）は高炉操業期間（日）と集塵圧力損失（KPa）との関係、図１（b）は
高炉操業期間（日）と高炉炉頂圧力回収設備による発電量（KW）×１０３との関係を示す図である。 FIG. 1 is a diagram illustrating a conventional operation method in a blast furnace gas cleaning facility. FIG. 1 (a) is a relationship between a blast furnace operation period (days) and a dust collection pressure loss (KPa), and FIG. it is a diagram showing the relationship between the blast furnace operation period (day) and the power generation amount of blast furnace top pressure recovery system (KW) × 10 3.

図１に示すように、高炉ガス清浄設備における従来の操業方法は、通常操業は圧力損失の小さい静電集塵部Ｂを用い、この静電集塵部Ｂを連続運転中、集塵板へ堆積（集塵）したダストを水洗・除去するために、スプレーノズルからの水を連続して集塵板５へ噴霧していた。   As shown in FIG. 1, in the conventional operation method in the blast furnace gas cleaning equipment, the normal operation uses an electrostatic dust collecting part B with a small pressure loss, and the electrostatic dust collecting part B is continuously operated to the dust collecting plate. In order to wash and remove the accumulated dust (dust collection), water from the spray nozzle was continuously sprayed onto the dust collection plate 5.

ところが、この操業により前記スプレーノズルが一部閉塞した場合、また、冷却用の循環水が汚濁した場合などは、当該ノズルから粒子の大きな水滴が、前記集塵板５に、飛散、跳ね返り、中央に配設している放電極６への飛散により異常放電が発生し、静電集塵部Ｂでの運転が停止し、この停止期間中は圧力損失を多く費やす湿式集塵部部Ａ（ベンチュリースクラバー）のみでの運転となるため、図１に示すように１ケ月に約１０日間、静電集塵機Ｂの荷電停止した場合には、発電損失量が約７２０KWhとなる。   However, when the spray nozzle is partially blocked by this operation, or when the circulating water for cooling is contaminated, a large water droplet of particles from the nozzle scatters and rebounds on the dust collecting plate 5. An abnormal discharge occurs due to scattering to the discharge electrode 6 disposed in the electrostatic discharge unit 6 and the operation in the electrostatic precipitator B is stopped. During this stop period, the wet precipitator A (Venturi) which consumes a lot of pressure loss As shown in FIG. 1, when the electrostatic precipitator B stops charging for about 10 days as shown in FIG. 1, the power generation loss amount is about 720 KWh.

また、異常放電した静電集塵部Ｂの修理・回復は、次の高炉設備全体の休風時にしか実施できないため、１回/月程度行われる高炉の定期修繕（定修）後に荷電停止となる場合、長い場合には静電集塵部Ｂの修理・回復に約１ケ月間かかる場合があり発電損失量は約３倍の２１６０KWhに達していた。   In addition, repair and recovery of the abnormally discharged electrostatic precipitator B can be performed only during the next blast furnace facility downtime, so charging is stopped after regular repairs (regular repairs) of the blast furnace that are performed once a month. In such a case, the repair and recovery of the electrostatic precipitator B may take about a month, and the power generation loss amounted to about 2 times 2160 KWh.

図２は、本発明における高炉ガス清浄設備の操業方法を例示する図であり、図２（a）は高炉操業期間（日）と集塵圧力損失（KPa）との関係、図２（b）は高炉操業期間（日）と高炉炉頂圧力回収設備による発電量（KW）×１０３との関係を示す図である。
本発明における高炉ガス清浄設備の操業方法は、高炉炉頂圧力回収設備４を有する高炉１から発生する高炉ガスを、可変スロートを有する湿式集塵部Ａ（ベンチュリースクラバー）と静電集塵部Ｂとにより清浄化する高炉ガス清浄設備の操業方法であって、高炉ガスを前記高炉炉頂圧力回収設備４へ通ガスする際に、下記工程１と工程２とを交互に繰り返して実施することを特徴とする。 FIG. 2 is a diagram illustrating an operation method of the blast furnace gas cleaning facility according to the present invention. FIG. 2 (a) shows the relationship between the blast furnace operation period (days) and the dust collection pressure loss (KPa), and FIG. 2 (b). is a diagram showing the relationship between the blast furnace operation period (day) and the power generation amount of blast furnace top pressure recovery system (KW) × 10 3.
In the operation method of the blast furnace gas cleaning equipment in the present invention, the blast furnace gas generated from the blast furnace 1 having the blast furnace top pressure recovery equipment 4 is divided into a wet dust collection part A (Venturi scrubber) having a variable throat and an electrostatic dust collection part B. The operation method of the blast furnace gas cleaning equipment to be purified by the above, wherein when the blast furnace gas is passed through the blast furnace top pressure recovery equipment 4, the following steps 1 and 2 are alternately repeated. Features.

ここに、工程１：前記湿式集塵部Ａの可変スロートをほぼ全開として散水のみを行い、高炉ガスの集塵を前記静電集塵部Ｂで実施する工程。   Here, step 1: a step in which the variable throat of the wet dust collecting part A is almost fully opened and only watering is performed, and blast furnace gas dust is collected in the electrostatic dust collecting part B.

工程２：前記静電集塵部Ｂの運転を停止させた後、当該静電集塵部Ｂの電極に堆積したダストを水洗すると共に、前記前記湿式集塵部Ａの可変スロートをほぼ全閉にして高炉ガスの集塵を前記湿式集塵部Ａで実施する工程。   Step 2: After stopping the operation of the electrostatic dust collector B, the dust accumulated on the electrode of the electrostatic dust collector B is washed with water, and the variable throat of the wet dust collector A is almost fully closed. And collecting the blast furnace gas in the wet dust collecting section A.

図２に示すように、圧力損失の低い静電集塵部Ｂによる集塵と、圧力損失の高い湿式集塵部Ａによる集塵とを交互に繰り返して実施し、静電集塵部Ｂにおける集塵板に堆積するダストを静電集塵部の運転を停止し間歇的に水洗・除去することにより、放電線の異常放電が発生することが皆無となり静電集塵部での長期間の運転停止をなくして回収エネルギーの低下を防止すると共に、集塵効率を向上させることができる。   As shown in FIG. 2, the dust collection by the electrostatic dust collection unit B having a low pressure loss and the dust collection by the wet dust collection unit A having a high pressure loss are alternately performed. By stopping the operation of the electrostatic precipitator and intermittently washing and removing the dust accumulated on the dust collector, there is no occurrence of abnormal discharge of the discharge line, and there is no long-term discharge at the electrostatic precipitator. It is possible to prevent the reduction of recovered energy by eliminating the operation stop and improve the dust collection efficiency.

また、湿式集塵部Ａによる集塵は、静電集塵部Ｂの荷電電圧の低下が始まる直前に１０分間〜３０分間実施し、引き続き静電集塵部Ｂによる集塵を行うことにより、圧力損失の少ない静電集塵部Ｂによる集塵時間を長くすることにより、高炉炉頂圧力回収設備による回収エネルギーを増加させることができる。   In addition, the dust collection by the wet dust collection unit A is performed for 10 minutes to 30 minutes immediately before the decrease of the charging voltage of the electrostatic dust collection unit B, and then the dust collection by the electrostatic dust collection unit B is performed, By increasing the dust collection time by the electrostatic dust collection section B with little pressure loss, the energy collected by the blast furnace top pressure recovery facility can be increased.

湿式集塵部Ａによる集塵を、静電集塵部Ｂの荷電電圧の低下が始まる直前、１０分間〜３０分間実施するのは、電極に堆積するダストの量により必要な洗浄時間が相違するからであり、１０分間未満では洗浄が不十分となり、また、３０分間以上では洗浄は飽和し、高炉炉頂圧力回収設備での発電量がその分低下するからである。   The dust collection by the wet dust collection unit A is performed for 10 to 30 minutes immediately before the decrease in the charging voltage of the electrostatic dust collection unit B. The required cleaning time differs depending on the amount of dust accumulated on the electrodes. This is because the cleaning is insufficient if it is less than 10 minutes, and the cleaning is saturated if it is 30 minutes or more, and the amount of power generation in the blast furnace top pressure recovery facility is reduced accordingly.

また、本発明の操業方法によれば、電極の洗浄中に異常放電が発生する心配がないので、静電集塵部Ｂの電極に堆積したダストを有効圧200Kpa以上400Kpa以下の高圧水により洗浄して洗浄時間を短時間にすることにより、高炉炉頂圧力回収設備による回収エネルギーを増加させることができる。   Further, according to the operation method of the present invention, there is no fear of abnormal discharge during the cleaning of the electrode, so the dust accumulated on the electrode of the electrostatic precipitator B is cleaned with high-pressure water having an effective pressure of 200 Kpa to 400 Kpa. By shortening the cleaning time, the energy recovered by the blast furnace top pressure recovery facility can be increased.

静電集塵部Ｂにおける集塵板へ堆積（集塵）するダストを水洗・除去するためには、静電集塵部の運転を停止してスプレーノズルからの水を集塵板へ噴霧する。よって、前記従来技術の如く、放電線の異常放電が発生することが皆無となり、静電集塵部での運転が長期間にわたって停止することがない。また、前記のスプレーノズルからの集塵板への散水は、より強力な噴霧（有効圧200Kpa〜400Kpaの高圧洗浄など）が可能となり、集塵板の清掃が完璧となる。   In order to wash and remove dust accumulated (collected) on the dust collector in the electrostatic dust collector B, the electrostatic dust collector is stopped and water from the spray nozzle is sprayed onto the dust collector. . Therefore, unlike the prior art, abnormal discharge of the discharge line is never generated, and the operation in the electrostatic precipitator does not stop for a long time. Further, the water spraying from the spray nozzle to the dust collecting plate enables more powerful spraying (such as high pressure cleaning with an effective pressure of 200 Kpa to 400 Kpa), and the dust collecting plate is perfectly cleaned.

前記有効圧とは、実際の当該スプレーから噴霧される水圧から、一般的な高炉のガス圧を差し引いたものであり、この有効圧が200 Kpa未満では噴霧される噴霧水の拡がり形状（角度）が小さくなると共に、噴霧水の勢いが小さくなり、目的とする集塵極の洗浄が不十分となる。また、有効圧が400 Kpaを超えると、集塵極での洗浄効果が飽和し、超えた分、高圧ノズルに送水するポンプの電力ロスとなる。以上によりスプレーノズルから集塵板へ噴霧する当該スプレーの有効圧としては有効圧200Kpa以上400Kpa以下が好ましい。   The effective pressure is obtained by subtracting the gas pressure of a general blast furnace from the water pressure sprayed from the actual spray, and when this effective pressure is less than 200 Kpa, the spread shape (angle) of spray water sprayed , The momentum of the spray water is reduced, and the intended dust collecting electrode is not sufficiently cleaned. Also, if the effective pressure exceeds 400 Kpa, the cleaning effect at the dust collecting electrode is saturated, and the excess power loss of the pump that feeds water to the high-pressure nozzle. As described above, the effective pressure of the spray sprayed from the spray nozzle to the dust collecting plate is preferably an effective pressure of 200 Kpa to 400 Kpa.

静電集塵部を連続運転中に集塵板へ堆積（集塵）したダストは、この間全く水洗・除去されないが、集塵効率が低下する直前に工程２を実施し、集塵板は、それにより清浄化するためを集塵効率が低下しない。   Dust accumulated (dust collection) on the dust collection plate during continuous operation of the electrostatic dust collection unit is not washed or removed at all during this time, but step 2 is performed immediately before the dust collection efficiency decreases. As a result, the dust collection efficiency is not lowered for cleaning.

図３は、本発明を適用する実際の高炉ガス清浄設備を使用した事前テスト結果を示す図である。   FIG. 3 is a diagram showing the results of a preliminary test using an actual blast furnace gas cleaning facility to which the present invention is applied.

図３に示す如く、実設備を使用したテストにより、連続散水しなくても、集塵効率が低下することのなき期間を見極めた結果、静電集塵部Ｂの集塵板６に蓄積するダストは、従来の如くスプレーノズルからの散水を実施しないため、時間と共に集塵板が汚れ、放電線への荷電装置の電流値が増加しているが、ダストへの荷電力が低下し集塵性能が低下する荷電電圧の低下が始まる直前、即ち、本テスト結果の一例によると４８ｈｒ経過する直前期間に、１０分間〜３０分間の有効圧200Kpa〜400Kpaの高圧洗浄を実施することにより、荷電電圧および荷電電流を回復することができ、本発明の効果が確認された。尚、前記ダストへの荷電力が低下し集塵性能が低下する直前時期は、実際の操業において、ダストの性状、操業条件などにより、若干相違する。よって、本発明の実施において、予め、実際の操業による前記集塵性能が低下する時期を数回にわたり把握し、その時期より、若干の余裕を見込んで、この直前時期を設定するとよい。   As shown in FIG. 3, as a result of determining a period in which the dust collection efficiency does not decrease even if continuous watering is not performed in a test using actual equipment, accumulation is performed on the dust collection plate 6 of the electrostatic dust collection unit B. As dust does not spray water from the spray nozzle as in the past, the dust collecting plate becomes dirty with time, and the current value of the charging device to the discharge line increases, but the load power to the dust decreases and the dust collection Immediately before the start of the decrease in the charging voltage at which the performance deteriorates, that is, immediately before 48 hours elapses according to an example of the test result, the charging voltage is increased by performing high pressure cleaning with an effective pressure of 200 Kpa to 400 Kpa for 10 minutes to 30 minutes. Further, the charging current can be recovered, and the effect of the present invention was confirmed. It should be noted that the time immediately before the load on the dust is reduced and the dust collection performance is lowered is slightly different in actual operation depending on the properties of the dust, the operation conditions, and the like. Therefore, in the practice of the present invention, it is preferable to grasp in advance several times the time when the dust collection performance due to actual operation deteriorates, and set the immediately preceding time with some allowance from that time.

高炉ガス清浄設備における従来の操業方法を例示する図である。It is a figure which illustrates the conventional operation method in a blast furnace gas cleaning equipment. 本発明における高炉ガス清浄設備の操業方法を例示する図である。It is a figure which illustrates the operating method of the blast furnace gas cleaning equipment in this invention. 本発明を適用する実際の高炉ガス清浄設備を使用した事前テスト結果を示す図である。It is a figure which shows the preliminary test result using the actual blast furnace gas cleaning equipment to which this invention is applied. 本発明の操業方法を適用する高炉ガス清浄設備を例示する図である。It is a figure which illustrates the blast furnace gas cleaning equipment to which the operation method of the present invention is applied.

符号の説明Explanation of symbols

Ａ 湿式集塵部（ベンチュリースクラバー）
Ｂ 静電集塵部
１ 高炉
２ ダストキャッチャー
３ 炉頂圧力制御弁
４ 炉頂圧力回収設備
５ 集塵板
６ 放電極
７ 水位制御弁 A Wet dust collector (Venturi scrubber)
B Electrostatic dust collector 1 Blast furnace 2 Dust catcher 3 Furnace top pressure control valve 4 Furnace top pressure recovery equipment 5 Dust collector 6 Discharge electrode 7 Water level control valve

Claims (3)

高炉炉頂圧力回収設備を有する高炉から発生する高炉ガスを、可変スロートを有する湿式集塵部と静電集塵部とにより清浄化する高炉ガス清浄設備の操業方法であって、高炉ガスを前記高炉炉頂圧力回収設備へ通ガスする際に、下記工程１と工程２とを交互に繰り返して実施することを特徴とする高炉ガス清浄設備の操業方法。
ここに、工程１：前記湿式集塵部の可変スロートをほぼ全開として散水のみを行い、高炉ガスの集塵を前記静電集塵部で実施する工程。
工程２：前記静電集塵部の運転を停止させた後、当該静電集塵部の電極に堆積したダストを水洗すると共に、前記前記湿式集塵部の可変スロートをほぼ全閉及び前記工程１の散水を継続して高炉ガスの集塵を前記湿式集塵部で実施する工程。 A method of operating a blast furnace gas cleaning facility for cleaning blast furnace gas generated from a blast furnace having a blast furnace top pressure recovery facility by a wet dust collection section having a variable throat and an electrostatic dust collection section, the blast furnace gas being A method of operating a blast furnace gas cleaning facility characterized in that when gas is passed to a blast furnace top pressure recovery facility, the following step 1 and step 2 are alternately repeated.
Here, step 1: a step of performing dust collection of blast furnace gas in the electrostatic dust collection unit by performing variable sprinkling of the wet dust collection unit with the variable throat almost fully open and performing only watering.
Step 2: After stopping the operation of the electrostatic precipitator, the dust accumulated on the electrode of the electrostatic precipitator is washed with water, and the variable throat of the wet precipitator is substantially fully closed and the step A step of continuing the watering of 1 and collecting the blast furnace gas in the wet dust collecting section. 前記工程１から工程２への交互の繰り返し時期を前記工程１における静電集塵部の荷電電圧の低下が始まる直前時期とし、当該直前時期に１０分間〜３０分間の前記工程２を実施後、引き続き工程１を継続実施することを特徴とする請求項１に記載の高炉ガス清浄設備の操業方法。   The alternating repetition time from the step 1 to the step 2 is set as a time immediately before the decrease in the charging voltage of the electrostatic dust collecting part in the step 1, and after performing the step 2 for 10 minutes to 30 minutes in the immediately preceding time, 2. The method for operating a blast furnace gas cleaning facility according to claim 1, wherein step 1 is continued. 前記静電集塵部の電極に堆積したダストを有効圧200Kpa以上400Kpa以下の高圧水により洗浄することを特徴とする請求項１または請求項２に記載の高炉ガス清浄設備の操業方法。   The method of operating a blast furnace gas cleaning facility according to claim 1 or 2, wherein dust accumulated on the electrode of the electrostatic dust collection unit is washed with high-pressure water having an effective pressure of 200 Kpa to 400 Kpa.
JP2007037255A 2007-02-19 2007-02-19 Method for operating blast furnace gas cleaning facility Pending JP2008202071A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007037255A JP2008202071A (en) 2007-02-19 2007-02-19 Method for operating blast furnace gas cleaning facility

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007037255A JP2008202071A (en) 2007-02-19 2007-02-19 Method for operating blast furnace gas cleaning facility

Publications (1)

Publication Number Publication Date
JP2008202071A true JP2008202071A (en) 2008-09-04

Family

ID=39779868

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007037255A Pending JP2008202071A (en) 2007-02-19 2007-02-19 Method for operating blast furnace gas cleaning facility

Country Status (1)

Country Link
JP (1) JP2008202071A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010046071A1 (en) * 2008-10-20 2010-04-29 Sms Elex Ag Method for scrubbing a flue gas of a metallurgical plant and flue gas scrubbing apparatus
CN102899431A (en) * 2012-10-23 2013-01-30 秦皇岛首秦金属材料有限公司 Method for quantitatively recovering abnormal furnace condition of blast furnace
CN103285697A (en) * 2013-05-22 2013-09-11 江苏新鹏重型机电制造有限公司 Bag type dust collector
CN103405984A (en) * 2013-08-15 2013-11-27 褚圣锋 High temperature oil smoke purifier
CN103566695A (en) * 2013-11-12 2014-02-12 清华大学 Enhanced coupled-mode embedded type electrostatic-bag integrated dust collector
CN103908859A (en) * 2014-02-14 2014-07-09 周庆余 Integrated high-efficiency wet dust collector
CN103949348A (en) * 2014-04-30 2014-07-30 南通亚泰船舶工程有限公司 Dust collector anode plate group, dust collector anode plate group module, dust collector anode plate group system and module installation method
CN104745237A (en) * 2015-03-25 2015-07-01 陕西美斯林能源科技研究院 Process method for collecting dust and recycling oil from pyrolyzed high-temperature oil gas
CN105126516A (en) * 2015-08-17 2015-12-09 中国重型机械研究院股份公司 Cylindrical vertical-type wet-type explosion-proof compression-resistant desulphurizing and dedusting device
CN105728194A (en) * 2016-04-15 2016-07-06 安徽工业大学 Wet type electrostatic precipitator
CN105999951A (en) * 2016-07-01 2016-10-12 呼伦贝尔东北阜丰生物科技有限公司 Treatment method for cooling, deodorization, desulfurization and denitrification of slurry-spraying granulation tail gas
CN107281871A (en) * 2017-07-06 2017-10-24 北京北科环境工程有限公司 It is a kind of to be used to sinter/improvement the device of pelletizing wet desulfurization flue gas deep treatment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS579811A (en) * 1980-06-18 1982-01-19 Nippon Steel Corp Method for operation of plant for cleaning of blast furnace gas
JPS586389A (en) * 1981-07-01 1983-01-13 新日本製鐵株式会社 Method of operating dust collector
JPS61107959A (en) * 1984-10-30 1986-05-26 Nippon Steel Corp Operation of vertical wet type electric dust collector
JPH11290720A (en) * 1998-04-08 1999-10-26 Seikow Chemical Engineering & Machinery Ltd Method for washing wet electric dust collector
JP2001190982A (en) * 2000-01-06 2001-07-17 Sumitomo Heavy Ind Ltd Electric precipitator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS579811A (en) * 1980-06-18 1982-01-19 Nippon Steel Corp Method for operation of plant for cleaning of blast furnace gas
JPS586389A (en) * 1981-07-01 1983-01-13 新日本製鐵株式会社 Method of operating dust collector
JPS61107959A (en) * 1984-10-30 1986-05-26 Nippon Steel Corp Operation of vertical wet type electric dust collector
JPH11290720A (en) * 1998-04-08 1999-10-26 Seikow Chemical Engineering & Machinery Ltd Method for washing wet electric dust collector
JP2001190982A (en) * 2000-01-06 2001-07-17 Sumitomo Heavy Ind Ltd Electric precipitator

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010046071A1 (en) * 2008-10-20 2010-04-29 Sms Elex Ag Method for scrubbing a flue gas of a metallurgical plant and flue gas scrubbing apparatus
CN102899431A (en) * 2012-10-23 2013-01-30 秦皇岛首秦金属材料有限公司 Method for quantitatively recovering abnormal furnace condition of blast furnace
CN103285697A (en) * 2013-05-22 2013-09-11 江苏新鹏重型机电制造有限公司 Bag type dust collector
CN103405984A (en) * 2013-08-15 2013-11-27 褚圣锋 High temperature oil smoke purifier
CN103566695A (en) * 2013-11-12 2014-02-12 清华大学 Enhanced coupled-mode embedded type electrostatic-bag integrated dust collector
CN103908859B (en) * 2014-02-14 2015-11-25 周庆余 Integrated efficient wet scrubber
CN103908859A (en) * 2014-02-14 2014-07-09 周庆余 Integrated high-efficiency wet dust collector
CN103949348A (en) * 2014-04-30 2014-07-30 南通亚泰船舶工程有限公司 Dust collector anode plate group, dust collector anode plate group module, dust collector anode plate group system and module installation method
CN104745237A (en) * 2015-03-25 2015-07-01 陕西美斯林能源科技研究院 Process method for collecting dust and recycling oil from pyrolyzed high-temperature oil gas
CN105126516A (en) * 2015-08-17 2015-12-09 中国重型机械研究院股份公司 Cylindrical vertical-type wet-type explosion-proof compression-resistant desulphurizing and dedusting device
CN105728194A (en) * 2016-04-15 2016-07-06 安徽工业大学 Wet type electrostatic precipitator
CN105999951A (en) * 2016-07-01 2016-10-12 呼伦贝尔东北阜丰生物科技有限公司 Treatment method for cooling, deodorization, desulfurization and denitrification of slurry-spraying granulation tail gas
CN107281871A (en) * 2017-07-06 2017-10-24 北京北科环境工程有限公司 It is a kind of to be used to sinter/improvement the device of pelletizing wet desulfurization flue gas deep treatment

Similar Documents

Publication Publication Date Title
JP2008202071A (en) Method for operating blast furnace gas cleaning facility
JP5705443B2 (en) Finishing flue gas desulfurization apparatus and exhaust gas treatment system using the same
JP4970081B2 (en) Blast furnace gas cleaning equipment and operating method thereof
WO2008038349A1 (en) Electric dust collector, discharge electrode, method for producing the discharge electrode, and method for producing discharge needle
JP2011161330A (en) Apparatus for denitrifying exhaust
JP2008212803A (en) Apparatus for removing oil mist
JP2008036534A (en) Electric dust collector
CA2713979C (en) A method and a device for controlling the rapping of an esp
KR101436381B1 (en) Electrostatic precipitator for cleaning
JP2013198855A (en) Method for cleaning eliminator and apparatus for cleaning eliminator
CN104226480B (en) Wet type dust remover and water pond sewage discharging system and sewage discharging method thereof
KR101974008B1 (en) Wet type electrostatic precipitator combined with calcium carbonate manufacturing equipment and fine dust removal method using the same
CN103432895B (en) Method and system for processing blockage of heat exchanger of desulfurization system
JP2009131832A (en) Cleaning method of blast furnace gas, and cleaning facility
CN212759137U (en) Cleaning device for polar plates of electrode wires of electric dust collector
CN215030045U (en) Electric dust remover
KR101742735B1 (en) Method for removing hydrogen sulfide, and device for the same
JPH11290720A (en) Method for washing wet electric dust collector
JP6390004B2 (en) Electric dust collector
CN103341299A (en) Self-cleaning wet type electrostatic precipitation demister capable of working continuously
JP2012050900A (en) Exhaust gas-treating equipment
JP4256795B2 (en) Cleaning method of electric dust collector
KR101334937B1 (en) Apparatus for purifying exhaust gas using carbon wire collecting system
JP3091445B2 (en) Method and apparatus for removing oil dust from electrostatic oil collecting dust collector
CN204841948U (en) Antidrip pipeline

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20091102

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20120319

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120403

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20120528

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120925

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20130219